The user is asked to enter two valid zip codes. The function then returns the "great circle" distance between the
two zip codes entered. The "great circle" distance is the "as the crow flies" distance. Driving distance will almost always be greater.

The user enters a 5 digit zip code, and a radius in miles to define the search radius. A radius of no more than 75 miles
is allowed by the function. The function returns all zip codes, and their city information, which fall within the entered radius of the entered zip code.

Note that this function is similar to the later defined functions for 3 digit zip codes, except this function uses
all 5 digits of zip codes for a finer search, and more accurate distance calculated.

If the user knows how to spell a city exactly, this function will return zip code, and other information about
the City entered by the user. Optionally, a state code can be selected, and a narrower search will be performed. If a state
code is not entered, "ALL" will return information for all cities in the file spelled exactly as entered.

Note that the exact spelling of the name is critical, and the user may wish to use the following function if no cities are returned
spelled exactly as entered.

This function is similar to the previous function, except the user may enter only part of a city's name. For example, entering "armingto" (without the quotes) will find
"Farmington" (and any other City containing the entered phrase).

If too wide a search string is entered, the user may be overwhelmed with output. To find "Farmington", a search string of "Farm" or "ton" will bring up a surprizing number of cities. A blank entry might try to return 80,000
Cities, so a degree of caution might be appropriate.

As with the previous function, a state code can be optionally entered, or "ALL" will return
all Cities containing the entered phrase.

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